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Successful Hydrothermal Synthesis of α-Fe2O3 Hexagonal Micro-platelets and Its Application in Li-Ion Battery
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Successful Hydrothermal Synthesis of α-Fe2O3 Hexagonal Micro-platelets and Its Application in Li-Ion Battery
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Innovation Foundation of BUAA for PhD Graduates (YWF-12-RBYJ-023)

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    摘要:

    采用水熱法成功合成了α-Fe2O3六邊形微米片。將NaOH溶解在PEG400和蒸餾水中形成混合溶液制備Fe(OH)3，利用Fe(OH)3在堿液中的熱分解和再結(jié)晶反應(yīng)制得α-Fe2O3。通過XRD、SEM手段對比分析PEG400和水熱反應(yīng)時堿液濃度對產(chǎn)物成分和形貌的影響。結(jié)果顯示，在制備過程中使用PEG400，且水熱反應(yīng)時堿液濃度為2.5 mol/L的情況下可以成功合成α-Fe2O3六邊形微米片。不使用PEG400時產(chǎn)物為α-FeOOH納米棒；使用PEG400時產(chǎn)物的成分和形貌均隨著堿液濃度的增大而變化，堿液濃度從1 mol/L增加到2.5 mol/L，產(chǎn)物成分由α-FeOOH逐漸變?yōu)棣?Fe2O3，形貌由條狀變?yōu)榱呅纹瑺??？梢?，PEG400的使用和水熱反應(yīng)時堿液濃度的合理選擇對形成六邊形片狀α-Fe2O3起到很重要的作用。將合成的α-Fe2O3六邊形微米片應(yīng)用于鋰離子電池負(fù)極材料，其初始可逆容量為674.9 mAh·g-1

    Abstract:

    α-Fe2O3 hexagonal micro-platelets were prepared via a simple hydrothermal process in the presence of an organic solvent PEG400. The synthetic method was based on the hydrothermal oxidative decomposition and the recrystallization of Fe(OH)3 precursor in a basic solution of NaOH. The crystalline structures and morphologies of the as-obtained samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the alkali environment during the hydrothermal reaction on product morphology were investigated. According to the results, α-Fe2O3 hexagonal micro-platelets could be directly prepared in a basic solution of NaOH (2.5 mol/L) when using PEG400 in the reaction system. The product morphology changes from rodlike to platelike shape when the alkali concentration increases from 1 mol/L to 2.5 mol/L. Therefore, the use of PEG400 and the hydrothermal growth alkali concentration play an important role in the formation of such platelike microstructure of α-Fe2O3. When the α-Fe2O3 hexagonal micro-platelets are used in Li-ion battery, it exhibits an initial reversible capacity of 674.9 mAh·g-1

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黃麗宏,陳云貴. Successful Hydrothermal Synthesis of α-Fe2O3 Hexagonal Micro-platelets and Its Application in Li-Ion Battery[J].稀有金屬材料與工程,2013,42(10):2014~2018.[Huang Lihong, Chen Yungui. Successful Hydrothermal Synthesis of α-Fe2O3 Hexagonal Micro-platelets and Its Application in Li-Ion Battery[J]. Rare Metal Materials and Engineering,2013,42(10):2014~2018.]
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  • 收稿日期:2012-09-27
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